Chaltab
Explorer
None of the stuff you listed as Pre-4E decision points. Movement used to be measured in inches, not 5' squares. Opportunity Attacks were only made core in 3rd Edition. There weren't even Feats and Skills prior to 3rd Edition.None of what? The maneuver stuff?
And no, tactical combat was not really a thing before 3rd, at least not what we're talking of. Tactics more involved tiering your minions and hirelings into the best possible formation and managing the logistics of dungeoneering without dying horribly or running out of resources. So while yeah, the Fighter's own personal actions in combat were similarly limited before 4th Edition, they were both Better At It in previous editions, and more fundamentally, the game was Very Different. Through 2E and into 3E the fundamental assumptions of AD&D changed drastically from OD&D and Gary Gygax's 1E. And this is ignoring the parallel but quite different evolution of the Basic line, where Fighters could learn special techniques based on their choice of weapons.
So yeah, changing magic to skill roles? Is a HUGE departure, and much, much more drastic a change than Fighters having techniques. Again, at some point you have to decide if you really want to play D&D at all; it's never been a game with Skill rolls at the core, but there are plenty of systems that are. Why not use one of those?